The DragonFly Cobalt from AudioQuest is a flash drive-sized Digital Audio Converter (DAC), preamplifier, and headphone amplifier that natively connects to a USB Type-A port, or a USB Type-C port using an included USB Type-A to USB Type-C adapter. It provides improved sound compared to the Red and Black models thanks to a 2.1V output, 64-bit digital volume control, an ESS ES9038Q2M DAC chip, a PIC32MX274 microcontroller draws less current and improves processing speed, and improved power filtering reduces the effects caused by Wi-fi, Bluetooth, and cellular noise. Compatible with Windows, Mac, iOS, and Android, the DragonFly Cobalt drives most headphones using its 3.5mm / 1/8" jack, and can also be connected to powered speakers, amplifiers, and receivers.
Manufacturer's product page: https://www.audioquest.com/dacs/dragonfly/dragonfly-cobalt